What is the concentration of pure water?
Correct answer: C. 55.5 mol/L
- A. Both a and b
- B. 45.5 mol/L
- C. 55.5 mol/L
- D. none of these
Explanation
One litre of water weighs about 1000 g, and the molecular mass of H₂O is about 18 g/mol, giving 1000 ÷ 18 ≈ 55.5 mol/L. The value 45.5 mol/L does not follow from water's molecular mass.
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